Question

Arithmetic mean by _________ is the sum of all observations in a series divided by the total number of observations.

• A. assumed mean method
• B. direct method
• C. step deviation method
• D. none of the above

Answer 1

The correct option is B direct method

The direct method of finding the arithmetic mean involves finding the ratio of the sum of total observations to the number of observations.

A worked example:

Find the arithmetic mean of numbers: 5, 9, 8, 3, 7

$\overline{X}=\frac{5+9+8+3+7}{5}$

$\overline{X}=\frac{32}{5}$

$\overline{X}=6.4$